faft: Fix error in logging

BUG=chrome-os-partner:35902
TEST=none

Change-Id: Ibe3236693abfa5b7554e5168eb118f37b7828574
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/37111
Reviewed-by: Tom Wai-Hong Tam <waihong@chromium.org>
diff --git a/server/cros/faftsequence.py b/server/cros/faftsequence.py
index adde4e9..7e38658 100644
--- a/server/cros/faftsequence.py
+++ b/server/cros/faftsequence.py
@@ -593,12 +593,12 @@
         """
         root_dev = self.faft_client.get_root_dev()
         logging.info('Copying kernel from %s to %s. Please wait...',
-                     (from_part, to_part))
+                     from_part, to_part)
         self.faft_client.run_shell_command('dd if=%s of=%s bs=4M' %
                 (self._join_part(root_dev, self.KERNEL_MAP[from_part]),
                  self._join_part(root_dev, self.KERNEL_MAP[to_part])))
         logging.info('Copying rootfs from %s to %s. Please wait...',
-                     (from_part, to_part))
+                     from_part, to_part)
         self.faft_client.run_shell_command('dd if=%s of=%s bs=4M' %
                 (self._join_part(root_dev, self.ROOTFS_MAP[from_part]),
                  self._join_part(root_dev, self.ROOTFS_MAP[to_part])))